(1) Original Series: All of these books in the original series were written and illustrated by Mary Tourtel (1874-1948), the English artist who created the "Rupert Bear" character. They were published by the firm Sampson Low, Marston & Co. Ltd. (often referred to just as Sampson Low) in the years 1928-36. There were 46 books in this original series and they all had distinctive yellow covers.

(2) Woolworths Series: The British retail chain Woolworths reprinted 18 titles from the Original Series. These books were published in the 1960s or 1970s (the books are undated). This Woolworths Series has its own numbering (No. 1 through to No. 18) which has no relation to the numbering of the Original Series. The titles had bright yellow covers.(1) Original Series